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| author | Andrey Ryabinin <a.ryabinin@samsung.com> | 2015-02-13 22:39:59 (GMT) |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-02-14 05:21:41 (GMT) |
| commit | c420f167db8c799d69fe43a801c58a7f02e9d57c (patch) | |
| tree | 3dff6731a0459d554ae81d07b557721d6b72f773 /arch/x86/mm/kasan_init_64.c | |
| parent | 393f203f5fd54421fddb1e2a263f64d3876eeadb (diff) | |
| download | linux-c420f167db8c799d69fe43a801c58a7f02e9d57c.tar.xz | |
kasan: enable stack instrumentation
Stack instrumentation allows to detect out of bounds memory accesses for
variables allocated on stack. Compiler adds redzones around every
variable on stack and poisons redzones in function's prologue.
Such approach significantly increases stack usage, so all in-kernel stacks
size were doubled.
Signed-off-by: Andrey Ryabinin <a.ryabinin@samsung.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Konstantin Serebryany <kcc@google.com>
Cc: Dmitry Chernenkov <dmitryc@google.com>
Signed-off-by: Andrey Konovalov <adech.fo@gmail.com>
Cc: Yuri Gribov <tetra2005@gmail.com>
Cc: Konstantin Khlebnikov <koct9i@gmail.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/x86/mm/kasan_init_64.c')
| -rw-r--r-- | arch/x86/mm/kasan_init_64.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c index 3e4d9a1..5350870 100644 --- a/arch/x86/mm/kasan_init_64.c +++ b/arch/x86/mm/kasan_init_64.c @@ -189,11 +189,18 @@ void __init kasan_init(void) if (map_range(&pfn_mapped[i])) panic("kasan: unable to allocate shadow!"); } - populate_zero_shadow(kasan_mem_to_shadow((void *)PAGE_OFFSET + MAXMEM), - (void *)KASAN_SHADOW_END); + kasan_mem_to_shadow((void *)__START_KERNEL_map)); + + vmemmap_populate((unsigned long)kasan_mem_to_shadow(_stext), + (unsigned long)kasan_mem_to_shadow(_end), + NUMA_NO_NODE); + + populate_zero_shadow(kasan_mem_to_shadow((void *)MODULES_VADDR), + (void *)KASAN_SHADOW_END); memset(kasan_zero_page, 0, PAGE_SIZE); load_cr3(init_level4_pgt); + init_task.kasan_depth = 0; } |